What Are Symptoms Of Depression And Social Anxiety?

Hi!! My name is Maddie, I ve been having this problem where I get very quiet around certain people, almost to the point where it becomes uncomfortable to sit there and attempt to make conversation. I start getting really fidgety and want to say something, but for some reason I can t think of one single thing to say. My hands get clammy and I just can t be myself. It s weird because around my family and people younger/older than me, I m really outgoing. But, when I m around people my age, I m shy and awkward. People talk over me and I feel like my opinions don t matter. Nobody can hear me when I talk and I get annoyed because I m asked to repeat what I said four times. Nobody likes to repeat things. So, I guess my question is why am I like this? Is this something that can be fixed? I cannot keep doing this, it hurts too much and I wish others could see me the way I think of myself. I guess I need to be more confident? How do I work on this? Is there medicine I can take? I ve been looking into things about depression and social anxiety, is that what this is? I need major help, this has started effecting how I act in school and at dance, I don t think I can handle it much longer.